Public Date:
1409531: CVE-2016-9962 docker: insecure opening of file-descriptor allows privilege escalation
The runc component used by `docker exec` feature of docker allowed additional container processes to be ptraced by the pid 1 of the container. This allows the main processes of the container, if running as root, to gain low-level access to these new processes during initialization. An attacker can, depending on the nature of the incoming process, leverage this to elevate access to the host. This ranges from accessing host content through the file descriptors of the incoming process to, potentially, a complete container escape by leveraging memory access or syscall interception.

Find out more about CVE-2016-9962 from the MITRE CVE dictionary dictionary and NIST NVD.

CVSS v3 metrics

CVSS3 Base Score 6.4
CVSS3 Base Metrics CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity High
Privileges Required High
User Interaction None
Scope Unchanged
Confidentiality High
Integrity Impact High
Availability Impact High

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux 7 Extras (docker-latest) RHSA-2017:0123 2017-01-17
Red Hat Enterprise Linux 7 Extras (runc) RHSA-2017:0127 2017-01-17
Red Hat Enterprise Linux 7 Extras (docker) RHSA-2017:0116 2017-01-17


Red Hat would like to thank the Docker project for reporting this issue. Upstream acknowledges Aleksa Sarai (SUSE) and Tõnis Tiigi (Docker) as the original reporters.

External References

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